Extends Widget (View, Evented).
Constructor needs to support being passed in a "url" property.
Remove "blur" event from close() method since SuperView's close() method does it for us already.
- close() - done!
- open() - done!
- modal - bool - if true, set z-index to something huge [stage]
- orientation - done!
- title - done!
- blur - done!
- close - done!
- focus - done!
- open - done!
Update API docs with support for properties: